Political jurist, philosopher, and publicist, Christian Thomasius (1655–1728), in seeking to set apart the ordering principle of political society from that of the religious community, in effect put forth two distinct ethics of mutuality, an “intrinsic” ethic of inherent purpose and an “extrinsic” ethic of instrumentality, the former characterized by disinterested love, in need of no further justification, the latter characterized by prudential reciprocity, in demand of a rational grounding. Unity in the former is viewed as consensual and necessary, whereas it is seen as plural and contingent in the latter, thus designating politics as the domain of instrumentality, plurality, and contingency. Similarly, citizenship is sharply contrasted with the idea of fraternity. Its defining quality is identified with decorum, which, though it entails elements of moral and legal accountability, is held to be neither strictly moral nor strictly legal. Its effective operation is, however, posited on the possibility of an unfalsified consciousness. In exploring the category of decorum as an ethic of mutuality, reference is made to contemporary discussions on liberal and communitarian theory and on the conditions of rational debate in politics.